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Conference Papers Year : 2016

ChPT parameters from tau-decay data

A. Rodríguez-Sánchez
A. Pich
  • Function : Author


Using the updated ALEPH V-A spectral function from tau decays, we determine the lowest spectral moments of the left-right correlator and extract dynamical information on order parameters of the QCD chiral symmetry breaking. Uncertainties associated with violations of quark-hadron duality are estimated from the data, imposing all known short-distance constraints on a resonance-based parametrization. Employing proper pinched weight functions, we obtain an accurate determination of the effective chiral couplings L10 and C87 and the dimension-six and -eight contributions in the Operator Product Expansion.

Dates and versions

in2p3-01215889 , version 1 (15-10-2015)



A. Rodríguez-Sánchez, M. González-Alonso, A. Pich. ChPT parameters from tau-decay data. 18th High-Energy Physics International Conference in Quantum Chromodynamics (QCD 15), Jun 2015, Montpellier, France. pp.108-112, ⟨10.1016/j.nuclphysbps.2016.02.023⟩. ⟨in2p3-01215889⟩
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